Piston-packing expander.



G. GHRISTENSUN. PISVTON PACKING EXPANDER. APPLICATION FILED NOV.`21,1910.

PasnteaFeb. 21, 1,911

UNITED sra'LswPATENT ouin-on.

GEORGE cHBIsTENsoN, or NEVADA. MISSOURI. iA'ssIGNoR To H. w.JOHNS-MANVILLE COMPANY, A` CORPORATION OF NEW YORK.

PISTON-PCKING EXPANDER.

Specification of Letters Patent.

Patented Feb. 21, 1911.

application med november-"21, 1910. serial No. 593,379.

-for use on pistons in the cylinders of air brakes.

My present invention 1s an improvement `on the constructions shown in myPatent No. 802,540, dated Aug. 6, 1.907, and that l shown in patent toJohn Emory Meek, No.

. above noted.

924,087, dated June 8, 1900. ln a packing expander for air brake pistonsof the gencral character shown in my said patent it is desirable, bothfor economy of material, and for reasons of adaptability to existingstructures, to -makc the flange portion as thin as possible, as set outin the patentto Meek But in order to secure the highest degree ofelasticity and resiliency in the completed structure, it is necessaryt0-use a highly tempered steel, and such highly tempered steel can notconveniently be` drawn down lto the thin flange desired, when thestructure is made integral by the process of drawing through a die,which is the most economical method of manufacture. To avoid thediiiicult-ies arising from these conflicting conditions I have inventeda composite structure in which the resiliency is furnished by a ring ofspring steel'of preferably circular cross section while thc flange isformed of a thin strip of sheet. steel which may be of low temper andless resiliency.

The best form of apparatus at present known to me embodying my inventionis illustrated in the accompanying sheet of drawing in which:

Figure 1 is a perspective View of the exandcr ring, and F ig. 2 is across section on ine 2-2 of Fig. l.

Through the drawings like reference chan. acters indicate like parts.

5 is the ring of highly tempered steel, preferably of circular crosssection, which may be formed by cutting the required length from a steelrod of the proper size and bending to form a circle. 6 is a strip ofthin sheet metal. or mild steel, eut from an ordinary sheet of4 suchmaterial. This thin strip of metal ntay be attached to the` ring 5 inany convenient vay, as by welding, but preferably I fasten it by bendinga portion 4 of one edge of the strip about the 60 ring 5, as shown inthe drawings. Preferably the abutting ends of the circular structure soformedarc cut diagonally, as indicated at 7 in Fig. 1.

The advantages of my invention include. the prod" Lion at low cost of apacking expander having the highest resiliency and the thinnest possibleflange. The fiange being formed of metal of low temper will bend withoutbreaking, so that the possibilities of destruction in use and handlingare decreased, as well as those in manufacture.

Various chr.l es in shape and proportions of parts could be made in pactice without departing from the principle of my invention. In somecases the ring 5 might. be omitted if the bent strip of metal 6 hadsufficient elasticity and resiliency, but preferably I employ the ring5, as it can be given the necessary temper to produce exactly thegraduated degree of resiliency desired for different sizes of cylinderand differentV degrees of air pressure, while it would be practicallydifliculty if not impossible 'to give a very high temper to the thinstrip 6 and then bend or draw it into the shape required. i

Having, therefore, describedl my invention, I claim: l 1. A pistonpacking expander having in combination a ring of elastic metal and athin strip of sheet material fastened .to the ring and forming a flangethereon, extending at right angles to the plane of the ring.

Q. A pistonpacking expander having in combination a ring of elasticinetal and a thin strip of sheet material wrapped around the ring andprojecting at ri ht angles tothe plane of the ring to form a angethereon.

composite piston packing expander formed of a ring of spring steel of"'ci'rcular cross section, and a strip of sheet st* bent around the ringand projecting at right angles to the plane of the ring to forni aflange from the outer side of the ring.

4. A composite piston expander formed of a ring of steel of high temper,and a Strip of sheet metal of low temper and high duclility fastened to'the ring :1nd forming a flange thereon, extending :it right angles tothe pla-ne of the ring.

.3. A Composite pimin expander formed of :i ringof'stvznmf liiggglitemper, and zx strip tilitxY bont :i1-mind the rilwA and no'ecinq l h l.

nt right anillas to the plane of the ung to forni a flange from theouter sld@ 0l the ring.

` (i. A nihil mw inclini" ex )ander comhaving nnc odge cin-ved bnvk uponitself and the strip-so formed bnnt Into a Circle Wll'h dismnnected butnlinftnig ends, the Short bent edge of t'llc Simp lwing on tho Inside ofthe ring' so fm'nwd. und the long nncnrvcd edge extendingy nt ,rightingles m the' plane of sand ring.

GEORGE (l1 l Rl'lll f'itnessesz A. PARKER Snri'ln, M. G. Cmwifonn.-

uson.`

